Ruminal kinetic parameters of different particle size fractions were estimated using four
lactating dairy cows in a 4×4 Latin square experiment. Cows received red clover-grass silage alone
diet. Ruminal contents and faeces were divided into six particle size fractions by wet sieving.
Indigestible (iNDF) and potentially digestible (pdNDF) neutral detergent fibre were separated by a
12d ruminal in situ incubation. Particles >2.5 mm formed the greatest dry matter, iNDF and pdNDF
pools in the rumen. Passage rates of iNDF and pdNDF increased with decreasing particle size.
Particle breakdown in the rumen was a relatively slow process (0.041 h-1). Contribution of particle
breakdown to turnover of different particle size fractions of rumen iNDF decreased with decreasing
particle size while the contribution of passage increased. Accumulation of iNDF in the rumen was
greater than generally observed with grass-based diets and pdNDF was rapidly digested.
CITATIONS(3):
1.
Ruminal large and small particle kinetics in dairy cows fed red clover and grass silages harvested at two stages of growth A.R. Bayat, M. Rinne, K. Kuoppala, S. Ahvenjärvi, A. Vanhatalo, P. Huhtanen Animal Feed Science and Technology
A comparison of ruminal or reticular digesta sampling as an alternative to sampling from the omasum of lactating dairy cows F. Fatehi, S.J. Krizsan, H. Gidlund, P. Huhtanen Journal of Dairy Science
Ruminal large and small particle kinetics in dairy cows fed primary growth and regrowth grass silages harvested at two stages of growth A.R. Bayat, M. Rinne, K. Kuoppala, S. Ahvenjärvi, P. Huhtanen Animal Feed Science and Technology
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